Question: What group or class of chemicals has the greatest tensile strength?
Paraphrase: Chemicals from what class/group has the largest tensile strength?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q17339814 . ?ent wdt:P5479 ?obj . ?ent wdt:P31 wd:Q17339814 } ORDER BY DESC(?obj)LIMIT 5 
Answer: nylon